Fix peerDependency issue

[DaniSchenk]

Hi, I use your plugin and it's very useful for me.
But now I have to update moment to version 2.29.
Will you update your peerDependency in the next time?
Best regards,
Peter

Originally posted by @pit999 in #28 (comment)

[DaniSchenk]

Hey @pit999,

I changed the peer deps to

"peerDependencies": {
    "moment": ">=2.15.x"
  },

and I hope that solves your issue